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The brain, spinal cord, and nerves are part of the __________. A. muscular system B. nervous system C. skeletal system D. digestive system

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Moly42
B) Nervous System

Your Brain, spinal cord, and nerves are  part of the large network of cells and fibers that transmit nerve impulses throughout your body. 
isaacholton7
The answer is B.) nervous system

The fact that the nerves are mentioned in the question should give the answer away, but the brain sends and receives the messages, the spinal chord transports them, and the nerves sends and transports those impulses.